abstracts: geology 77 



interbedded with other rocks. The principal ozokerite mines and 

 prospects have been opened in the Wasatch formation and are scattered 

 irregularly through a stratigraphic distance of 600 to 700 feet. The 

 ozokerite fills cavities that have resulted from fracturing. The com- 

 position, properties, origin, and uses of ozokerite are discussed, and 

 the mines and prospects are described. R. W. S. 



GEOLOGY. — The oil and gas geology of the Foraker quadrangle, Osage 

 County, Oklahoma. K. C. Heald. U. S. Geological Survey 

 Bulletin 641-B. Pp. i-iv, 17-47, with 2 plates and 11 figures. 

 1916. 

 This paper describes and portrays those features of the Foraker 

 quadrangle that may be of interest and assistance in the discovery and 

 development of accumulations of oil and gas. Under the heading 

 "Stratigraphy" those strata valuable as key horizons in mapping 

 structure are described in detail, and the probable positions of oil 

 sands are given. The geologic structure is portrayed by map and 

 stereogram, and the anticlines believed to be favorable for the accumula- 

 tion of oil and gas are described in detail. In conclusion specific 

 recommendations for prospecting are given, and the writer's belief 

 concerning the probability of the occurrence of oil and gas accumulations 

 is set forth. R. W. S. 



GEOLOGY. — Possibilities of oil and gas in north-central Montana. 

 Eugene Stebinger. U. S. Geological Survey Bulletin 641-C. 

 Pp. 49-91, with 4 plates. 1916. 



The thick bodies of Upper Cretaceous shale with which most of the 

 oil and gas in both Wyoming and Alberta are associated are known to 

 be continuous between these two localities under the plains of Montana, 

 making it apparent that favorable structural features, especially 

 anticlines and domes similar to those that are productive in Wyoming 

 and Alberta, offer a chance of success with the drill in this part of Mon- 

 tana. The facts observed appear to warrant the conclusions that a 

 considerable gas territory, comparable in extent to the Alberta fields, 

 may be found, and that the area shows some probability of yielding oil. 



The character and distribution of the sedimentary rocks, particularly 

 those of importance in the search for oil and gas, are discussed, and the 

 geologic structure of north-central Montana is described. Particular 

 attention is paid to the structural features of the area of tilted and 

 faulted rocks north and south of the Bearpaw Mountains. R. W. S. 



